lou: good evening confusing messages from the white house, president obama walks back from his red line decree on syrian use of chemical weapons. this aftee u.s. intelligence sources yesterday reported that on at least two occasions, assad regime had used seron gas on its population, the president instead laying out another red line for the assad regime, that is already slaughtered tens of thousands of its civilians. >> horrific as it is, when mortars are fired on civilians to use potential once one crosses another line. with respect to international norms and law. and that is going to be a game changer. lou: president obama has been repeating since as far back of august o last year, that assad's use of chemical weapons on his own people would cross a so-called red line, that would result in u.s. involvement in now 2 year long syrian civil iar. president today however called for more investigation into the intelligence communities assessment of the use of chemical weapons, and president incredibly said that syria had crossed a different red line, with their constant murderous assault on